EASA Module 7 study guide
EASA Module 7 · Work through your exam, one topic at a time.
Module 7 - Maintenance Practices is one of the knowledge modules that make up the EASA Part-66 aircraft maintenance licence syllabus. Its regulatory home is Commission Regulation (EU) No 1321/2014 on continuing airworthiness, adopted on 26/11/2014 and published in the Official Journal under reference OJ L 362, 17.12.2014, p. The EASA Module 7 study guide has 10 sections and about 3,145 words.
01Safety Precautions - Aircraft and Workshop
Hangar accidents come from four energy sources: mechanical (engines, hydraulics, compressed gas), chemical (fuel, solvents, hydraulic fluid, paint, welding fumes), electrical and electrostatic, and stored mass (jacking, towing, lifting). A candidate must know the controls for each: PPE matched to the task (eye, hearing, hand, respiratory, fall protection), bonding and grounding during refuelling and defuelling, no smoking or open flame inside the refuelling zone, and a written hot-work permit for any welding, brazing, grinding or cutting near the aircraft.
313 words, about 2 min02Workshop Practices
Good workshop practice is the discipline that turns a manual instruction into a repeatable job. Understand tool control and shadow boards with a count at the end of every task (a missing spanner is a FOD report); cleanliness and segregation of parts; correct use of the vice, files (never used without a handle), hacksaws, drills and taps; drilling speeds and lubrication; thread repair by insert or oversize; and correct selection of fasteners, washers and locking devices.
316 words, about 2 min03Tools
Hand tools and measuring instruments are examined as much for their limitations as for their use. Know the common measuring tools and their resolution: steel rule (0.5 mm), vernier caliper (typically 0.02 mm), micrometer (0.01 mm), dial test indicator (0.01 mm or finer), feeler gauges for gaps and clearances, go/no-go gauges for quick acceptance checks, and depth and bore gauges.
324 words, about 2 min04Engineering Drawings, Diagrams and Standards
Engineering drawings are a controlled language. Understand the title block (part number, nomenclature, drawing number, revision status, scale, units, projection symbol), the difference between first-angle and third-angle orthographic projection and how the truncated-cone symbol tells you which is used, the view types (front, plan, end, section, detail, auxiliary, isometric) and line conventions (visible, hidden, centre, dimension, break, cutting plane).
283 words, about 1 min05Fits and Clearances
Every dimension on a drawing is a nominal size with an upper and a lower limit; the difference between the limits is the tolerance. Allowance is the intentional difference between the nominal sizes of the hole and the shaft (minimum clearance or maximum interference); clearance is the actual gap in an assembled pair.
332 words, about 2 min06EWIS and Electrical Cables
EWIS is the aircraft electrical wiring interconnection system, maintained to a standard wiring practices manual rather than to personal judgement. Understand the components: wire and cable types and insulation (PTFE, ETFE, PVC/nylon), wire gauge and current rating, conductor stranding, identification marking and sleeving, splices, terminals, connectors with contact retention, backshells and strain relief, clamps and standoffs, and bonding and grounding paths.
305 words, about 2 min07Riveting, Pipes and Hoses, Springs, Bearings, Transmissions and Control Cables
Riveting: know solid rivet types (universal MS20470, countersunk MS20426, brazier), materials and heat treatment (2024 icebox rivets are kept cold and used within their out-of-refrigerator life), hole size and deburring, edge distance (minimum two diameters), pitch and shop-head formation. The classic rule: rivet length = grip length + 1.5 × diameter for a protruding head, giving a shop head about 1.5D wide and 0.5D high.
320 words, about 2 min08Material Handling and Welding, Brazing, Soldering
Material handling begins with identification: alloys must be traceable by marking, batch and certificate; heat-treated parts must not be centre-punched or engraved in a critical area; sheet is stored on edge, clean and protected; composites are kept in the specified freezer and out of sunlight. Observe shelf life (sealants, adhesives, primers, hoses, elastomers), keep parts in quarantine until inspected, and avoid contact between dissimilar metals such as aluminium and steel or carbon and aluminium, which drives galvanic corrosion.
325 words, about 2 min09Aircraft Weight and Balance; Aircraft Handling and Storage
Weight and balance: understand datum, arm, moment (weight × arm), empty weight and empty-weight CG, maximum take-off, landing and zero-fuel weights, and the CG envelope expressed in units of length or as a percentage of MAC between LEMAC and TEMAC. Weighing requires calibrated scales, level attitude, the correct configuration and correct fluid states.
325 words, about 2 min10Disassembly, Inspection, Repair, Assembly and Maintenance Procedures
Maintenance is a controlled sequence: plan against approved data (AMM, SRM, IPC, wiring practices manual, service bulletins, airworthiness directives), raise a work card, and only then touch the aircraft. Disassembly means tagging every part and connection, bagging and boxing hardware, recording the as-found condition, and protecting open lines and connectors.
302 words, about 2 min